18781780

素因数分解:

$2^2\times 5^1\times {\mathrm{939089}}^1$

素因数の和:939098

約数の個数: 12

約数和(自身を含む): 39441780

約数和(自身を除く): 20660000

約数列:

[1, 2, 4, 5, 10, 20, 939089, 1878178, 3756356, 4695445, 9390890, 18781780]

約数ペア:

[(1, 18781780), (2, 9390890), (4, 4695445), (5, 3756356), (10, 1878178), (20, 939089)]